<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href='https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.css' rel='stylesheet'>
    <link href='https://cdn.bootcdn.net/ajax/libs/minireset.css/0.0.2/minireset.min.css' rel='stylesheet'/>
    <link rel="stylesheet" href="dist/test.css">
    <link rel="stylesheet" href="../bootstrap/bootstrap.css">
    <title>container&grid</title>
</head>
<body>
    <div class="container">
        <div class="row">
            <div class="col-xl-4 col-sm-6 col-12">a</div>
            <div class="col-xl-12">b</div>
            <div class="col-xl-12">c</div>
            <div class="col-xl-12">d</div>
        </div>
    </div>
</body>
</html>